Heat exchanger

A heat exchanger comprising:

• a heat exchange core bundle in which a first heat-transfer fluid circulates;
• at least one inlet tank or outlet tank for a second heat-transfer fluid, said inlet/outlet tank comprising a bearing zone and at least one shoulder oriented toward the outside of said inlet/outlet tank in the region of the bearing zone;
• and
• at least one collector arranged on the periphery of the heat exchange core bundle and comprising:
• a base on which the bearing zone of the inlet/outlet tank is intended to rest,
• a lateral wall of which at least two portions are folded over onto the shoulder so as to fix the inlet/outlet tank by crimping against the heat exchange core bundle,
• wherein the lateral wall follows the contour of at least one corner of the heat exchange core bundle, said lateral wall comprising, on each side of the corner, a folded-over portion and comprising in the region of said corner a non-folded-over portion, the folded-over portions being connected continuously to the non-folded over portion.